Clicking on button cuts off window and appears empty or blank, some workarounds

Hi, I'm a new user of Checker Plus, just installed for an hour or two.When I click on the Checker Plus button, a white window appears and my Inbox isn't shown (Edit: further reading shows that my actual Inbox is cut off above the window view, and looks empty as I do not have enough emails to list).

I found a quick work around, which is to right click the icon and click 'Refresh'.

By doing this, I can click the Checker Plus button and see the Inbox fine, with the Opening animation included.

I have also noticed another work around, which is to uncheck and check the height CSS for the body, as shown in the screenshot on the far right of the dev tools.

Any help to resolve this would be appreciated.

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Edit: Oops, looks like this issue has been reported quite a few times. My mistake. Perhaps my workaround wasn't known before and might help?